Prefect Instructions
1
PRE3205 Dimmable Ceiling Mounted Photocell
Installation:
LOAD
Switching:
10A of lighting and or ventilation including incandescent,
fluorescent, compact fluorescent, low voltage (Switch primary
of transformer).
Dimming:
Maximum number of DSI or DALI ballasts is 10 unless the relay is
disabled then it is 20.
SUPPLY VOLTAGE: 220-240 Volts AC 50 Hz
LIGHT LEVEL: Adjustment 100 LUX to1000 LUX approx.
TERMINAL CAPACITY: 2.5mm2
MATERIAL: Flame retardant ABS, fixing clip polypropylene
TYPE: Class 2
TEMPERATURE: -10°C to 35°C
Operation:
The PRE3205 dimming photocell automatically adjusts the
light output of luminaires depending on the amount of natural
light available, to maintain constant brightness(maintained
illuminance) using either DSI or DALI digital dimming protocol.
An optional manual control, using a switch input, allows the user
to override the dimming levels and turn the output on and off.
In addition to changing the output level, the photocell can be
set to turn lighting on when the ambient light falls below a
preset level. The lighting can also be set to turn off when the
total light level rises above a separate preset level. An integral,
adjustable time delay prevents nuisance switching caused by,
for example, dark clouds. An integral infra-red sensor in the unit
allows the unit to be programmed using the Optional PRE5900L
programming handset. This gives complete flexibility over many
of the operating parameters. Without the handset, manual
adjustments can be made to the lux settings using the controls
on the rear of the sensor head.
The PRE5900L user handset can be used to change output lux
levels and override the lights on or off. The photocell is supplied
to be used with DSI dimming as standard. If the unit is to be
used with DALI dimming protocol, this can either be
pre-programmed before leaving The factory (please contact
Sales for further details), or the PRE5900L programming handset
can be used to program the photocell when installed.
Prefect Control Ltd Unit 2, Church Field Business Park, Church Field Road, Sudbury, Suffolk, CO10 2YF
Tel: 01787 320 604 Fax: 0845 450 3020 Email: mail@prefectcontrols.com Website: www.prefectcontrols.com
Due to our policy of continuous improvement, we reserve the right to change specifications without notice
Prefect Instructions
2
Installation Instructions:
1. Make sure the load is connected and in working order.
2. Isolate the mains supply to the circuit at the main consumer
unit.
3. Connect the controller via the terminal block. Live supply to the
L terminal, Neutral to the N terminal, and dimming ballast to
the DIM– and DIM+ terminals.
4. Use a small screwdriver to set the TIME thumbwheel to
minimum.
5. Use a small screwdriver to set the LUX thumbwheel to
minimum.
6. Power the unit up.
7. Slowly adjust the LUX thumbwheel to achieve the desired lux
level at the working plane.
8. The TIME setting changes the response time of the sensor. At
minimum the lux level changes rapidly, at maximum it changes
slowly. It is recommended to use the minimum timing for setup
purposes and then to leave it midway.
WARNING! This device works at mains potential. Be sure to take
care when working with electricity.
Not Used
Lux
Min
Max
Time
Min
Max
Wiring:
Wire the products as in the diagram opposite. This product
provides a dimming signal for the control of suitable fluorescent
ballasts. It does not provide a switching signal.
• For best results the unit should look towards working plane.
• Do not angle the sensor to point directly at the sun.
• Site the sensor so that it does not look directly at the light that
it is controlling.
To flush mount:
• Cut a 86mm hole in the ceiling.
• Insert the mounting clip into the hole and carefully push the
two fixings on the arms downwards until they grip firmly to
the ceiling.
• Unscrew the back plate, connect (see below) and re-fix the
back plate.
• Push the unit into the clip and setup as instructed.
To surface mount:
• Unscrew the back plate and fix straight to the ceiling or to a
BESA box.
• Connect and re-fix the back plate Setup as instructed.
Dimming
Ballast
1-10 Volt
or DSI
DIM
DIM
Neutral
Live
Prefect Control Ltd Unit 2, Church Field Business Park, Church Field Road, Sudbury, Suffolk, CO10 2YF
Tel: 01787 320 604 Fax: 0845 450 3020 Email: mail@prefectcontrols.com Website: www.prefectcontrols.com
Due to our policy of continuous improvement, we reserve the right to change specifications without notice
Not Used
Circuit protection
(If Required
N
LOUT
L
Prefect Instructions
3
Fault Finding:
Load does not come on:
Check to see if the live supply to the circuit is good. Strap across
the L and LIVE OUT terminal to turn the load on.
LIGHTS DO NOT GO OFF
Ensure that the area is left unoccupied for a greater time period
than the time out period set using the switch.
For LUX versions only, if the supply and wiring are good, check
the LUX level setting. Increase the LUX level setting to allow the
controller to turn on at higher ambient natural light level.
Make sure that the sensor is not adjacent to circulating air,
heaters or lamps.
Specification:
Load:
16 Amp resistive load
10 Amp incandescent lighting
6 Amp fluorescent lighting
3 Amp compact fluorescent lighting
3 Amp low energy lighting
3 Amp low voltage lighting (switch primary of transformer)
Fluorescent lighting (max 6 fittings recommended)
For fluorescent lighting total power factor correction capacitance
must not exceed 40μF.
3 Amp fans and ventilation equipment
Switch SON lighting loads via a contactor
SUPPLY VOLTAGE: 220-240 Volts AC 50 Hz
TIME OUT PERIOD: Adjustable 10 seconds to 60 minutes in
two ranges
LIGHT LEVEL: Optional adjustment by thumbwheel light to dark.
FIXING METHOD: Surface fixing 25mm deep plastic surface mount
moulded box. Flush fixing 25mm steel wall box or 32mm deep
cavity wall box.
TERMINAL CAPACITY: 4.0mm2
MATERIAL: Flame retardant ABS
TYPE: Class 2
TEMPERATURE: -10°C to 35°C
CONFORMITY: EMC-89/336/EEC-LVD-73/23/EEC
IMPORTANT NOTICE! This device should be installed by a qualified
electrician in accordance with the latest edition of the IEE wiring
regulations.
Prefect Control Ltd Unit 2, Church Field Business Park, Church Field Road, Sudbury, Suffolk, CO10 2YF
Tel: 01787 320 604 Fax: 0845 450 3020 Email: mail@prefectcontrols.com Website: www.prefectcontrols.com
Due to our policy of continuous improvement, we reserve the right to change specifications without notice